Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/DischargeTables.java @ 3436:0d63581c5df1

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FLYSArtifact: Prevent NPE in getOutputForState(). Why does this happen? flys-artifacts/trunk@5099 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 23 Jul 2012 08:38:23 +0000
parents b2ea89a665bc
children 1d9c9a3493ea
rev   line source
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e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
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1 package de.intevation.flys.artifacts.model;
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2
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3 import java.util.List;
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4 import java.util.Map;
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5 import java.util.HashMap;
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6 import java.util.Arrays;
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7
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8 import java.io.Serializable;
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10 import org.hibernate.Session;
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11 import org.hibernate.Query;
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13 import org.apache.log4j.Logger;
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15 import de.intevation.flys.backend.SessionHolder;
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16 import de.intevation.flys.model.Gauge;
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17 import de.intevation.flys.model.DischargeTable;
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18 import de.intevation.flys.model.DischargeTableValue;
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20 import gnu.trove.TDoubleArrayList;
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21
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22 /** Documentation goes here. */
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23 public class DischargeTables
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24 implements Serializable
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25 {
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26 /** Private logger. */
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27 private static Logger log = Logger.getLogger(DischargeTables.class);
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29 public static final double DEFAULT_SCALE = 100.0;
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31 public static final int MASTER = 0;
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33 protected List<String> gaugeNames;
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35 protected String riverName;
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37 protected double scale;
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39 protected int kind;
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41 protected Map<String, double [][]> values;
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43 public DischargeTables() {
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44 }
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46 public DischargeTables(String riverName, String gaugeName) {
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47 this(riverName, gaugeName, MASTER);
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48 }
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49
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50 public DischargeTables(String riverName, String gaugeName, int kind) {
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51 this(riverName, new String [] { gaugeName }, kind);
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52 }
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54 public DischargeTables(String riverName, String [] gaugeNames) {
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55 this(riverName, gaugeNames, MASTER);
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56 }
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58 public DischargeTables(String riverName, String [] gaugeNames, int kind) {
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59 this(riverName, Arrays.asList(gaugeNames), kind);
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60 }
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62 public DischargeTables(
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63 String riverName,
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64 List<String> gaugeNames,
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65 int kind
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66 ) {
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67 scale = Double.NaN;
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68 this.kind = kind;
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69 this.riverName = riverName;
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70 this.gaugeNames = gaugeNames;
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71 }
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72
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73 public double [][] getFirstTable() {
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74 return getFirstTable(DEFAULT_SCALE);
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75 }
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77 public double [][] getFirstTable(double scale) {
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78 Map<String, double [][]> values = getValues(scale);
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79 for (double [][] table: values.values()) {
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80 return table;
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81 }
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82 return null;
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83 }
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84
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85 public Map<String, double [][]> getValues() {
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86 return getValues(DEFAULT_SCALE);
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87 }
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89 public Map<String, double [][]> getValues(double scale) {
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90 if (values == null || scale != this.scale) {
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91 values = loadValues(scale);
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92 this.scale = scale;
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93 }
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94 return values;
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95 }
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96
1929
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97 /**
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98 * Returns mapping of gauge name to values.
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99 */
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100 protected Map<String, double [][]> loadValues(double scale) {
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101 Map<String, double [][]> values = new HashMap<String, double [][]>();
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102
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103 Session session = SessionHolder.HOLDER.get();
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105 Query gaugeQuery = session.createQuery(
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106 "from Gauge where name=:gauge and river.name=:river");
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107 gaugeQuery.setParameter("river", riverName);
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108
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109 for (String gaugeName: gaugeNames) {
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110 gaugeQuery.setParameter("gauge", gaugeName);
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111 List<Gauge> gauges = gaugeQuery.list();
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112 if (gauges.isEmpty()) {
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113 log.warn(
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114 "no gauge '"+gaugeName+"' at river '"+riverName+"'");
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115 continue;
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116 }
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117 Gauge gauge = gauges.get(0);
146
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118
311
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119 List<DischargeTable> tables = gauge.getDischargeTables();
146
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120
311
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121 if (tables.isEmpty()) {
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122 log.warn(
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123 "no discharge table for gauge '" + gaugeName + "'");
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diff changeset
124 continue;
146
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parents:
diff changeset
125 }
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parents:
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126
311
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127 // TODO: Filter by time interval
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128 DischargeTable table = tables.get(0);
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129
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130 double [][] vs = loadDischargeTableValues(table, scale);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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131
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132 values.put(gaugeName, vs);
146
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133 }
311
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134
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135 return values;
146
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136 }
329
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137
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138
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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139 /**
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140 * @param table The discharge table
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141 * @param scale The scale factor to adjust W and Q values.
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142 *
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143 * @return the values of a discharge table.
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144 */
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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145 public static double[][] loadDischargeTableValues(
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146 DischargeTable table,
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147 double scale
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148 ) {
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149 List<DischargeTableValue> dtvs = table.getDischargeTableValues();
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150
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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151 final double [][] vs = new double[2][dtvs.size()];
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152
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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153 int idx = 0;
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154 for (DischargeTableValue dtv: dtvs) {
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diff changeset
155 double q = dtv.getQ().doubleValue();
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156 vs[0][idx] = q * scale;
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diff changeset
157 vs[1][idx] = dtv.getW().doubleValue() * scale;
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158 ++idx;
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diff changeset
159 }
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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160
59af81364eb1 Improved the 'historical discharge' calculation: implemented findValueForW().
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161 return vs;
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diff changeset
162 }
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163
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164 private static final double EPSILON = 1e-5;
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165
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166 private static final boolean epsEquals(double a, double b) {
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167 return Math.abs(a - b) < EPSILON;
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168 }
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169
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170 private static final boolean between(double a, double b, double x) {
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171 if (a > b) { double t = a; a = b; b = t; }
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172 return x > a && x < b;
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173 }
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174
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175 public static double [] getQsForW(double [][] values, double w) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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176
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diff changeset
177 boolean debug = log.isDebugEnabled();
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178
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179 if (debug) {
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180 log.debug("getQsForW: W = " + w);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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181 }
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182
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183 double [] qs = values[0];
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diff changeset
184 double [] ws = values[1];
329
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185
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186 int N = Math.min(qs.length, ws.length);
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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187
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188 if (N == 0) {
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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diff changeset
189 if (debug) {
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190 log.debug("Q(" + w + ") = []");
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191 }
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diff changeset
192 return new double [0];
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diff changeset
193 }
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diff changeset
194
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diff changeset
195 TDoubleArrayList outQs = new TDoubleArrayList();
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diff changeset
196
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diff changeset
197 if (epsEquals(ws[0], w)) {
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diff changeset
198 outQs.add(qs[0]);
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diff changeset
199 }
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diff changeset
200
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diff changeset
201 for (int i = 1; i < N; ++i) {
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diff changeset
202 if (epsEquals(ws[i], w)) {
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diff changeset
203 outQs.add(qs[i]);
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diff changeset
204 }
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diff changeset
205 else if (between(ws[i-1], ws[i], w)) {
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diff changeset
206 double w1 = ws[i-1];
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diff changeset
207 double w2 = ws[i];
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diff changeset
208 double q1 = qs[i-1];
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diff changeset
209 double q2 = qs[i];
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diff changeset
210
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diff changeset
211 // q1 = m*w1 + b
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diff changeset
212 // q2 = m*w2 + b
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diff changeset
213 // q2 - q1 = m*(w2 - w1)
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diff changeset
214 // m = (q2 - q1)/(w2 - w1) # w2 != w1
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diff changeset
215 // b = q1 - m*w1
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diff changeset
216 // w1 != w2
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diff changeset
217
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diff changeset
218 double m = (q2 - q1)/(w2 - w1);
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diff changeset
219 double b = q1 - m*w1;
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diff changeset
220 double q = w*m + b;
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diff changeset
221
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diff changeset
222 outQs.add(q);
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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diff changeset
223 }
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
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diff changeset
224 }
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diff changeset
225
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diff changeset
226 double [] result = outQs.toNativeArray();
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diff changeset
227
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diff changeset
228 if (debug) {
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diff changeset
229 log.debug("Q(" + w + ") = " + Arrays.toString(result));
378
20c3a5b36434 Repaired DischargeTables.getQForW()
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diff changeset
230 }
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diff changeset
231
899ca89f497e Another partial fix for flys/issue499: Do the W to Q conversions
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2230
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232 return result;
329
0b2358bc716d Discharge table: Added static method getWForQ() to interpolate a w value for a given q value based on a given discharge table.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 328
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233 }
146
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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234 }
e8dfe6ba2000 Fetch w/q values of discharge tables for given gauges.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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235 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org